Mandrel extractor



Mar; 6, 192?.y 1,447,767.

R. M. DE VIGNIVEH. IVIANDREL EXTRACTOR.

FILED FEB. 24, 1922. 2 SHEETSQ'SHEET 2 `Patented Mar. 6, i923.

` inver .p jgfp ROBERT M. DE VGNER,OF BELLEFNTE, DELAVARE, f SSGNOBy, BY MESNEASSGN- MENTS, T0 NATONAL VULCANIZED FIBRE CO., 0F WI1*.LITGTON,DELAWARE,` A

CORPORATION OF`-DELAWARE rannDR-'EL nxfrnnofron.

Application filed February-24, 1922'. Serial No. 539,052.

To .all tli/toon, t may concern: *j

Beit known that I, ROBERT M. DE Vieninn,

a citizen-ofthe United States, and a resi-y dent 4of' Bellefonte, countyoi New Castle, Sta-teef Delaware, have invented certain new and useful Improvements-infMandrel vice for withdrawing mandrels' `from formedbretuloes or tubes of other material; to

provide means for increasing Vthe production" of ibre or other tubes which are formed by.employingmandrels5v to provide a mandrelextraeting mechanism wherebyL a mandrel can be quickly withdrawn from a tube on the mandrel without breakingybending, crimping or otherwise injuring the tube; and to provide other improvements as will hereinafter appear.

In the accompanying drawings, Fig. 1 represents an end elevation of a mandrel eX- tractingmachine embodying one formfof the present invention; Fig. 2 represents a side elevation of the same; Fig. 3 represents a detail in front elevation of one` form of mandrel engagingfclamp employed; Fig. 4.- represents a side elevation of the cla-mp shown in Fig. 3; Fig. 5 represents a section online 5 5 of Figjl.; Fig. 6 represents a detail of the jaws of the clamping means; -Fig..7 represents a sectionk on line 7--7 of Fig. 1; Fig. 8 represents an enlarged detail in elevation of the mounting for the spring valve closing? means infconjunction with the pressure fluidpipes; and Figg9 is a plan ofthe same; j 4 'j `Referring to the drawings, one form of the present invention consists of a head 10, here shown. as suspended by posts 11, such as standard pipe lengths, from a channel loa-r 12 or other suitable member, the ends of which are respectivel fast to angles 13 rigidly carried by .fixe beams le or the like. Suitable'stays 15 are provided betweenl the beamslt and the posts 11 to serve as braces to prevent lateraljdisplacement oi the suspended parts. v

Forpermitting amandrel 16 to pass through the head 10 and `thus be drawn out of a tube `17, which has been formednpon the mandrel` 16, thehead 10 .is provided with substantially centrally disposed opening 18, the ldiameter of which is greater' than the diameter ott-he mandrel 16 tobe withdrawn,- but less than the diameter of the tube i? carried by that mandrel. nthis connection it should he noted tli'atthe head 10 is suspended a distancefirom the floor line sufficient to allow `the usual length-7 mandrel tc beplacedin position beneath it so that oneend of the mandrel canbe readily `inserted through the opening 18.

ln order to gripl the end of the mandrelwhich. protrudes through the head l0, a clampingdevice is provided consisting, in the presentv instance of :two jaws 2O and having juxtaposed grippingV acesv22 which are arranged to be moved towards or away from each other while maintaining a substantially parallel relation. This opera tion' is accomplished by a lazy-tong construc- `tion comprising jaw links 2li and 25 having a common pivot 26 and connected respectively by pivot Studs 27, 28 and 30, 3l to the jaws 2O and 2l. The jawflinks 24 are kconnected bya pivot stud 82 toftwo 'links 33, and the' jaw links25 are 'connecte'dby a pivot stud 34 to two links 35. The links in one direction the lazy-tong structure will operate to open the jaws 20 andY 21, and if moved in the opposite direction will operate to close the jaws.

The pivot studs 28 and 31 `riderespectively inslots e0 and 4l, the former entend; ing longitudinally of the jaws 20, and the latterbeing similarly arrangedin thejaws- 21.` This arrangement assures free movevnient of the parts without binding and mainltainsthe proper relation oi theA jaws.

l and. 35 havea coinmonl pivot, stud `36 j connecting all to alug V37 lxedly v'secured `to a rod 38. Thus,` by movingthe rodv38 suitable valve controlled by a. lever all. Non

mally, the valve maintains` the cylinder-i2 in Vis connection with an exhaust pipe so that the jaws 2O and 2l are open but when the lever 44 is rotated in a clockwise direction theexhaust pipe is cut off and pressure fluid is admitted toV the `cylinder 42 from the pipe 43.

As a means for actuating the prime mover when the clamping jaws have been manually placed in position upon the end of a mandrel, the lever 44 is connected, for example, to a Vtoot treadle 46 by a cab-le 47 or other suitable means, so that depression of the `treadle 46 causes pressure Huid to enter the cylinder 42 and shift the rod 38 in the required manner.

For returning the lever 44 to its normal position for exhausting the cylinder 42 after a working stroke, a spring is provided which extends from the lever 44 to an eye-bolt 5l which serves "to clamp two plates 52 to the pipes 43 and 45. These Y plates 52 may be connected to any lixed part bu't the aforesaid pipes form a convenient .support upon which vthe plates can be adjustedto maintain the proper tension upon the spring 50. n

In the operation of the machine, the head 10 and its "supporting adjuncts are located at a convenient place with respect to the delivery end of a tube forming machine so that as each mandrel with the formed tube is received it can ybe transferred to the extracting device without loss of time. The operator passes one end of the mandrel 16 through the opening l18 to'bring that end of the tube 17 into abutting relation with the head 10, and then brings the clamping deviceinto position with the jaws 20 and 2l at opposite sides of the mandrel. The tootl treadle 46 is then pressed to cause the cable 47 to turn the valve lever 44 to admit `pressure fluid from the supply pipe 43 to the lower end of' the cylinder 42. This causes the rod 38 to move upwardly, as seen in Figs. l and 2, and this movement acting through the lazy-tong structure causes the jaws 20 and 2l to close upon the mandrel so that as the rod movement is continued the mandrel is withdrawn from the tube. As soon as the mandrel is removed the treadle 46 is released, whereupon the spring 50 returnsit to normal position and simultaneunitary structure has been devised for efectively extracting mandrels from'tubes in a minimum of time and without damage to the tube from which the mandrel is removed. Furthermore, the machine requires but one operator, whereas methods heretotore employed for the removal of mandrels require atleast two workmen to handle, and force out the mandrel by primitive manual means. g l Y lVhile but a single form is shown in which this invent-ion may be embodied, it is to be understood that the invention notV limited to any speciic construction, but might be applied in various vforms without departing from the spirit of the invention or the scope of the appended claims.

Having thus `described my invention, I

claim: ,y f

l. ln a mandrel extractingmachine, the

combination'lot a head having an opening vtherein to receive an,A end of a mandrel having a tube thereon, means to support said head, `a jaw mechanism arranged to receive said mandrel end, means for simultaneously causing said jaw lmechanism to: grip said mandrel andto move said mandrel axially, and means to prevent said tube moving in the same direct-ion.`

2. .In a mandrel extracting machine, the

combination of a heady having an opening v therein to receive an endof a mandrelhaw ing a tube thereon, means to support said head, a jaw mechanism arranged toreceive said mandrel end, means including a pressure actuated prime mover for simultaneously causing said jaw mechanism to grip said mandrel and to' move'said Vmandrel axially, and means to prevent said tube mov-V ing in the same direction.

3. In a mandrel extracting machine, the combination of ahead lhaving 'an opening therein. to receive van end of a mandrel have.

ing a tube thereon, said openinghaving'ga` diameter less than the outsidediameter 'of' said tube, means to` rigidly support said head, a jawme'chanism 'arranged to receive said mandrel end, and power means for causing said jaw mechanism to gripsaid mandrel and extract said mandrelfromsaid tube. p mi i' `4,'ln a mandrel extracting machine, the combination of a head having an `opening therein to receive an end of a mandrel hav-i ing a tube thereon, said opening having a `diameter less ythan the outside diameter of.

said tube, means to rigidlyv support said head, a `jaw mechanism arranged'to receive said mandrel end, and power means for. causing said jaw` mechanism to grip said mandrel and for causing said mechanism to move in oneadirection toA extractsaid mandrel from said tube. i

5. lIn a mandrel extracting machine, the combination of ahead'having Ian opening therein to receive an end of a mandrel having a tube thereon, said opening having a diameter less than the outside diameter of said tube, means to rigidly support said head, a jaw mechanism arranged to receive said mandrel end, power means for causing said jaw mechanism to grip said mandrel and for causing said mechanism to move in one direction to extract said mandrel from said tube, and means for moving said mechanism in the opposite direction to open said jaws.

6. ln a mandrel extracting machine, the combination of a head having an opening therethrough to pass a mandrel but to prevent the passage of a tube on said mandrel, means to rigidly support said head, a clamping device including a lazy-tong structure for engaging said mandrel, and means for actuating said structure to cause said clamping device to grip said mandrel and to move said device in a direction to extract said mandrel.

7 ln a mandrel extracting machine, the combination of a head having an opening therethrough to pass a mandrel but to prevent the passage of a tube on said mandrel, means to rigidly support said head, a clamping device including a lazy-ton structure for engaging saidI mandrel, ang manually controlled means for actuating said structure to cause said clamping device to grip said mandrel and to move said device in a direction to extract said mandrel.

S. ln a mandrel extracting machine, the combination of a head having an opening therethrough to pass a mandrel but to prevent the passage of a tube on said mandrel, means to rigidly support said head, a clamping device including a lazy-tong structure for engaging said mandrel, and means including a treadle for actuating said strucn ture to cause said clamping device to grip said mandrel and to move said device in a direction to extract said mandrel.

9. ln a mandrel extracting machine, the

combination of a head having an opening therethrough to pass a mandrel but to pre vent the passage of a tube on said mandrel, means to rigidly support said head, a clamping device including a lazytong structure for engaging said mandrel, means including a treadle for actuating said structure to cause said clamping device to grip said mandrel and to move said device in a direction to extract said mandrel, and spring means for returning said structure and.y treadle means to normal condition.

Signed at Wilmington, in the county of New Castle, and State of Delaware, this 18th day of February, 1922.

ROBERT M. DE VIGN IER. 

